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40kg Adjustable Dumbbells

€419,00 €599,00
With/without Stand
  • Easily shift from 5kg to 40kg
  • Pair of 17-in-1 Adjustable Dumbbells
  • Simply turn the dial to change the weight
  • 24 Months Warranty
🚚 FREE avg 2 day delivery
🛡️ 2-YEAR warranty on all dumbbells
😊 Over 75,000+ happy customers

Delivery and Shipping

We offer delivery to most EU countries. You can see a full list of delivery costs here. You can also check out our delivery FAQs here.

Why choose BrainGain
  • Fast delivery across Europe
  • Rated EXCELLENT on Trustpilot
  • Over 100,000 adjustable dumbbells sold
  • Spread the cost with Klarna
  • 24 month warranty as standard

Overview

Easily shift from 5kg to 40kg with the innovative BRAINGAIN 40kg Adjustable Dumbbells which are perfect for home workouts whether you’re training in your garage, the back garden or your living room. One pair of these adjustable dumbbells replaces a complete set of 17 fixed dumbbells saving you space, cost and time!

The BRAINGAIN 40kg Adjustable Dumbbells are perfectly designed and quality tested to ensure the highest level of safety for all users whether you are a beginner training for the first time or a professional with years of experience. Simply twist the dial on each side of the adjustable dumbbell to set the weight, pick up your weights and you can start training straight away and are a real evolution from the old style, spinlock style adjustable dumbbells.

Adjustable Dumbbells can be used for all your home workout needs and exercises including presses, swings, deadlifts, squats, curls, sit-ups, snatch, renegade row, twists, clean & press, thrust and more.

The 40kg Adjustable Dumbbells come with their own tray to facilitate simple weight changes and tidy storage. Separate stands can be purchased to bring the adjustable dumbbells up to waist height.

The Adjustable Dumbbells are designed to stay with you on your journey. Whether you’re starting on the lightest weight, or something heavier, the adjustable weights will be by your side as you gain strength and go through the weight range.

Features

The BRAINGAIN 40kg Adjustable Dumbbells is the equivalent to 17 individual fixed weight dumbbells. Increments: 5kg, 7kg, 9kg, 11kg, 13kg, 15kg, 18kg, 20kg, 22kg, 25kg, 27kg, 29kg, 32kg, 34kg, 36kg, 38kg, 40kg.

Dimensions: 45cm x 25cm x 25cm

Please note: dumbbells are sold as a pair, representing 2x 40kg so 80kg total. Order sent out in 3 boxes.

Warranty

All of our products come with a 24 month warranty as standard. During the warranty period we will repair or replace, at no charge, products or parts of the product defective because of improper materials or workmanship, under normal use and maintenance. Full Warranty Information can be found here.

For the most experienced iron-pumpers, while perfectly catering to beginners too.

The build quality is excellent. The knurled metal handle is the icing on the cake.

An industrial-strength set of weights with a smart design.

Robust... and comfy for most classic moves.

Ultra smooth and easy to twist... one of the sturdiest designs we tried.

  • 17 Dumbbells in 1

    Easily shift from 5kg to 40kg with the innovative BrainGain 40kg Adjustable Dumbbells. No more need for 17 separate weights.

  • Total Body Workouts

    Adjustable Dumbbells can be used for all your home workout needs and exercises including presses, swings, deadlifts, squats, curls, sit-ups, snatch, renegade row, twists, clean & press, thrust and more

  • Base or Stand

    The 40kg Adjustable Dumbbells come with their own tray to facilitate simple weight changes and tidy storage. Separate stands can be purchased to bring the adjustable dumbbells up to waist height.

Your Body Is Already Losing Muscle

From age 30, your body naturally loses muscle mass. Without resistance training, it only gets worse.

3-5%

muscle mass lost per decade from age 30. After 50, this accelerates to 1-2% per year.1

10-17%

lower risk of all-cause mortality, cardiovascular disease and diabetes from strength training.2

30-60 min

per week is the optimal dose - just 3x 20-minute sessions for maximum longevity benefit.3

1 Source 2 Source 3 Source

Built Different. Here's the Proof.

We surveyed 659 BrainGain customers across the Germany, France, Spain and 16 European countries. Here's what they told us.

90%

said the value justified the price or price wasn't even a concern.*

72%

train 3 or more times per week with their BrainGain dumbbells.*

81%

want to buy more BrainGain products (accessories, supplements, training).*

* Source: BrainGain Customer Survey, February 2026, n=659 across 5 markets.


INDEPENDENTLY TESTED

BrainGain adjustable dumbbells were tested by SaferBuy, an independent product verification institute, as mystery shoppers in October 2025.

97.5/100

Getting Started

100/100

Proofing – Product matches description

91.5/100

Packaging & Contents

0

Inconveniences found

SaferBuy Read the full report →

"Game-Changer for Home Workouts!"

These dumbbells are simply magnificent. They save space, time and money.
Structurally they are solid and aesthetically beautiful. In addition I must point out that they do not make any sound when shaken. Awesome price.

Michael, Trustpilot - Germany

DIMENSIONS

Length: 45cm

Height: 25cm

Width: 25cm

Product Highlights

Explore the key features of our 40kg Adjustable Dumbbells by clicking on the pulsing highlights.